CN102102392B - Integrated initial rainwater draining well and method for draining rainwater - Google Patents

Abstract

An integrated initial rainwater abandonment well, which is a device for separating the initial rainwater of a certain millimeter on the designated catchment surface of the abandoned flow, and separating the later net rainwater, thereby greatly improving the water quality of the reused rainwater. It consists of a buried rainwater inspection well and a storage tank. The rainwater inspection well is connected to the inlet and outlet pipes; the bottom of the storage tank is equipped with a slant plate sedimentation structure, and a discarded flow pipe is set at a certain distance from the bottom of the pool; a water tank and a baffle are set between the rainwater inspection well and the storage tank. When the highest water level is reached, a short flow is formed between the inlet and outlet pipes. The later rainwater passes through the rainwater inspection well and directly enters the outlet pipe for reuse. The initial rainwater is discarded in the storage tank. Drain slowly and stop when the effective minimum water level is reached. The invention has the advantages of simple structure, no need for manual operation, no power supply, simple maintenance, effective collection of polluted rainwater, and the waste pipe is not easy to be blocked if it is blocked, and it is easy to clear, and the buried environment has no effect on the appearance of the environment.

Description

Integrated initial rainwater abandonment well and method of rainwater abandonment

technical field

The invention belongs to the fields of environmental protection technology and rainwater reuse, and in particular relates to an integrated initial rainwater abandonment well and an operation method.

Background technique

Through scientific and technological novelty research, there are currently few research reports, patents, and practical engineering applications on the separation of initial rainwater by the initial rainwater abandonment device at home and abroad, and the current design and application of the existing initial rainwater abandonment device is not wide, and it cannot achieve no energy consumption. It is not easy to be blocked and does not need special management.

Due to the leaching, scouring and transportation of pollutants in the catchment area by the initial rainwater, most of the pollutants in the entire rainfall are contained in the initial few millimeters of rainwater. Generally, the concentration of pollutants in runoff is the highest at the initial stage of rainfall formation, and as the duration of rainfall increases, the concentration of pollutants in rainwater runoff gradually decreases, and finally maintains a low concentration range. Primary stormwater discards remove most pollutants from runoff, including fine or dissolved pollutants.

The existing initial rainwater abandonment devices include the following types: abandonment rainwater pools, switchable or small-tube abandonment wells, cyclone separators, automatic flap type initial rain separators, flow-type or rainfall-type rainwater initial abandonment devices, infiltration Abandoned flow wells and jumping weir rainwater diversion wells.

In the abandoned rainwater pool, the initial runoff flows into the corresponding volume of the pool and is stored. When it reaches a certain volume, it begins to flow into the rainwater collection system. The operation of emptying the rainwater at the initial stage of the waste flow rainwater pool is mostly controlled by valves, which requires manual operation. After each rain, the valves need to be opened to empty.

Switching type or small pipe abandonment well, two pipes connecting the downstream rainwater well and the downstream sewage well are buried in the rainwater inspection well at the same time, and the two pipes are equipped with simple manual gate valves or automatic gate valves for switching. The device needs to control the initial rainwater discharge flow through the control valve, which requires manual operation or power supply.

In the cyclone separator, the rainwater flows into the cyclone screen along the tangential direction. When the surface of the screen is dry at the beginning of rainfall. Under the action of the surface tension of the water and the slope of the screen, the rainwater flows to the central drainage pipe in a rotating state on the surface of the screen, and the initial rainwater is discharged into the rainwater or sewage pipe. As the rainfall continues, the surface of the screen is continuously infiltrated, and the tension of the water on the wet screen surface will be greatly reduced. In the middle and late stages, the rainwater will pass through the screen and collect into the water collection pipe, and finally enter the storage tank. The cyclone separator controls the amount of initial rainwater separation through the mesh number of the screen, but it cannot achieve precise control, and pollutants are easy to block the screen, which affects the initial rainwater volume.

The working principle of the automatic flap type primary rain separator is to use the automatically flipped flap to discard the flow. When there is no rainwater, the flap is at the position of the jettison pipe, and after the rainfall starts, the initial rain is discharged along the flap and through the jettison pipe. With the increase of rainfall, generally when the rainfall reaches 2-3 mm, the flap will automatically reverse by gravity, and the rainwater will enter the storage tank through the rainwater collection pipe along the flap. When the rain stops for a certain period of time, the flap will automatically return to its original position by gravity and wait for the next rain. The operation and maintenance of the automatic flap type primary rain separator is complicated, and the equipment is easily damaged and difficult to repair.

The flow type or rainfall type rainwater initial abandonment device works on the principle that the rainwater runoff or rainfall is used as the signal source, and the controller controls the opening and closing of the electric valve to meet the requirements of the initial rainwater abandonment. This device needs measurement signal and power supply to control the electric valve, and the operation and maintenance are complicated.

The permeation abandonment well is a device that has a certain storage volume and the function of filtering and intercepting sewage, and infiltrates the initial runoff into the ground. The device uses the volume of the well chamber to store a certain amount of initial runoff rainwater, and the excess rainwater overflows from the other end of the well; the well chamber has a seepage function, and the side wall and bottom of the well chamber are perforated to allow rainwater to penetrate into the ground. The device should be equipped with facilities to filter out impurities in the rain, and the part of the dissolved matter in the rainwater exceeding the limit value cannot be removed.

The jumping weir rainwater diversion well is a device that separates the initial rainwater by the weir plate. In the initial stage of rainfall, the parabolic jet flowing out of the rainwater inlet pipe is blocked by the weir plate and flows out from the jettison pipe; as the runoff increases during the rainfall process, the parabolic jet flow crosses the weir plate and flows out of the outlet pipe to be collected, thus reaching the initial rainwater purpose of abandonment. Jumping weir rainwater diversion wells cannot collect rainwater with small rainfall in the later period of rainfall.

Contents of the invention

The present invention aims at the deficiencies of the existing technology, improves the initial rainwater abandonment well at the present stage, provides an initial rainwater abandonment well and a method for simple construction, operation and maintenance, and solves the problem of operation and maintenance of the prior art Complicated, manual operation, power consumption and other disadvantages.

Technical scheme of the present invention is as follows:

The integrated initial rainwater abandonment well is a device that intercepts the rainwater with a certain initial cumulative rainfall (mm) on the selected catchment surface and separates the later net rainwater, thereby greatly improving the water quality of the reused rainwater. The rainwater inspection well and regulation and storage pool composition.

One side of the rainwater inspection well is connected to the water inlet pipe, which is connected to the municipal rainwater pipe, and the other side is connected to the outlet pipe, and the outlet water can be reused directly or after simple treatment; the inlet and outlet pipes are located on the same vertical plane as the water flow direction On, the bottom of the pipe of the water inlet pipe is level with the bottom of the pipe of the water outlet pipe. The water inlet pipe is connected to the rainwater collection pipe in the specified catchment area, and the pipe diameter and pipe material are the same as the rainwater pipe. The pipe diameter and pipe material of the outlet pipe are the same as those of the rainwater inlet pipe.

The storage tank is located under the rainwater inspection well, and communicates with the rainwater inspection well through the sink, and a 1# baffle is provided on the side of the sink near the outlet pipe; the storage tank is located far away from the sink. There is a water outlet, and a sloping plate sedimentation structure is arranged at the water outlet. A waste pipe is connected outside the sloping plate sedimentation structure and at a certain distance above the bottom of the pool. The distance from the water outlet of the storage tank to the diameter of a manhole.

The water tank is horizontally arranged at the center of the bottom end of the rainwater inspection well, and the center line of the water tank is perpendicular to the axis of the water inlet pipe; the water passing area of the water tank is equal to the cross-sectional area of the water inlet pipe, and the calculation formula for the width of the water tank is as follows:

d=(π/4)×(D ₁ ² /D ₂ )

Among them: d is the width of the gutter, mm; D ₁ is the diameter of the rainwater inlet pipe, mm; D ₂ is the diameter of the rainwater inspection well shaft, mm.

The height h ₁ of the 1# baffle installed on the gutter needs to be higher than the bottom of the outlet pipe and lower than the centerline of the outlet pipe, and its width is the diameter of the inlet pipe D ₁ +200mm, facing The center of the inlet and outlet pipes.

The sloping plate sedimentation structure at the water outlet of the storage tank adopts two sloping plates, both of which form an α angle (45° or 60°) with the bottom of the pool, and the two sloping plates are arranged obliquely side by side at intervals , the lower sloping plate is supported by a supporting plate, and the upper sloping plate is provided with a baffle, forcing the water flow in the storage tank to pass between the two sloping plates, keeping the water flow rate between the sloping plates less than 18mm/s, forming a sloping plate Precipitation effect, intercepting solid pollutants on the side far away from the waste pipe, ensuring that no solid pollutants flow through the waste pipe, and avoiding blockage of small diameter pipes;

The formula for calculating the distance between two inclined plates is as follows:

b≥

Among them: b is the distance between two slanting plates, mm; D ₄ is the diameter of small pipe jettison flow, mm, generally 40-80㎜; h ₁ is the height of 1# baffle, mm; h ₂ is the top of the storage tank The height difference between the outer wall of the top and the bottom of the small-diameter jettison pipe, mm; B is the width of the inner wall of the storage tank, mm;

The volume of the storage tank satisfies the following calculation formula:

V=ψ×H×A×10 ^-3

Among them, V is the storage tank volume, m3; ψ is the runoff coefficient; H is the initial rainfall that needs to be abandoned, mm, generally 3-12mm; Area, ^m2 ;

The effective water depth of the storage tank satisfies the following formula:

h ₄ = h - h ₃

Among them, h ₄ is the effective water depth of the storage tank, m; h is the design height of the storage tank, which is determined by the volume of the storage tank, m; h ₃ is the height of the sloping plate, where h ₃ =COSα, α is the height of the sloping plate and the pool the angle of the base, m;

The storage tank is also connected with a ventilation pipe to ensure unimpeded water flow.

The pipe diameter D ₃ of the discarding pipe is 300mm, and the diameter D ₄ of the pre-embedded pipe at the beginning of the discarding pipe in the storage tank wall is 10%-20% of the diameter D ₁ of the water inlet pipe, generally 40-80mm, Far smaller than the diameter of the water inlet pipe, the diameter of the pipe becomes D ₃ generally 300mm after the pipe exits the pool, and the waste flow pipe is finally connected to the municipal sewage system.

The abandonment process of the rainwater abandonment well at the initial stage of the integration is as follows:

1) When runoff begins to form on the catchment area, the rainwater enters the rainwater inspection well through the water inlet pipe, and then enters the storage tank through the sink;

2) Since the diameter of the start of the jettison pipe is much smaller than the diameter of the water inlet pipe, the outflow of the jettison pipe is much smaller than the water inflow of the water inlet pipe, and the initial rainwater begins to be stored in the storage tank. , the storage tank is full, and the rainwater begins to be stored in the rainwater inspection well;

3) When the water flow in the storage tank passes between the two sloping plates, the sloping plate sedimentation effect is formed, and the solid pollutants are intercepted on the side away from the jettison tube, ensuring that no solid pollutants flow through the jettison tube and avoiding blockage of small diameter pipes;

4) When the rainwater liquid level in the rainwater inspection well reaches the top of the water retaining plate in the rainwater inspection well, the reused rainwater begins to flow out. Since the distance between the inlet and outlet pipes is short and the rainwater inspection well is separated from the storage tank by the sink, Effectively prevent the water flow exchange between the rainwater inspection well and the storage tank, the rainwater forms a short flow between the inlet and outlet pipes, and the rainwater with poor water quality in the early stage is discarded in the storage tank, improving the quality of reused rainwater;

5) When the runoff of rainwater stops, the water flow in and out of the water pipe stops, and the discarded flow pipe slowly discharges the rainwater in the storage tank, and stops after reaching the effective minimum water level;

6) The solid waste entering the storage tank with the initial rainwater settles at the bottom of the tank, and after a period of time, it is discharged with a small sand suction pump. When the waste flow pipe is blocked, the cleaning personnel enter the storage tank to dredge the small pipe section. Abandonment pipe, the small diameter of the beginning of the abandonment pipe is short, and only the wall thickness of the storage tank is adjusted, which is convenient for dredging blockage.

Compared with the existing initial rainwater abandonment device, this integrated initial rainwater abandonment well has the following advantages:

1) Effectively intercept initial rainwater to ensure the quality of reused water. The existing initial rainwater abandonment device requires manual operation during the abandonment process, which cannot accurately control the abandonment flow, and the quality of reused rainwater cannot be guaranteed. The rainwater abandonment well in the early stage of the present invention is composed of a storage tank and a rainwater inspection well. After the rainwater forms runoff, it is first stored in the storage tank. When the storage tank is full, the water level in the rainwater inspection well begins to rise, and flows out after reaching a certain water level. Since the rainwater inspection well and the storage tank are provided with a sink and the inlet and outlet pipes connected to the rainwater inspection well are relatively short, a short flow is formed in the rainwater inspection well, thereby preventing the flow between the rainwater inspection well and the storage tank. The exchange of water flow effectively separates the initial rainwater from the later net rainwater, ensuring the quality of reused water. The invention is simple and effective in intercepting initial rainwater, and can accurately control the initial rainwater abandonment flow rate according to design requirements.

2) The structure is simple, the operating principle is simple, the whole operation process does not require manual operation, no power supply is required, and the discarding tube is not easy to block and easy to clear if it is blocked. Abandoned flow rainwater pool, switchable or small-pipe abandoned flow well, and automatic flap-type primary rain separator need an external power supply during operation, and sewage discharge requires manual operation. The initial rainwater abandonment well of the present invention is because the diameter of the starting end of the abandonment pipe is far smaller than the diameter of the water inlet pipe, so in the initial stage of the formation of rainwater runoff, the initial rainwater is stored in the outlet well because the water intake is far greater than the abandonment flow. After the runoff of rainwater stops, the inlet pipe stops water intake, and the initial rainwater is slowly discharged from the jettison pipe. The whole process does not require manual operation or power supply. And due to the existence of the sloping plate, the precipitation effect of the sloping plate is formed, which can intercept solid pollutants on the side far away from the jettison pipe, avoiding the pre-embedded small diameter of the beginning of the jettison from clogging. Easy clear.

Description of drawings

Fig. 1 is the plane structure schematic diagram of the rainwater abandonment flow well at the initial stage of this integration;

Fig. 2 is the I-I sectional view of Fig. 1;

Fig. 3 is the II-II sectional view of Fig. 1;

In the figure: 1—Rainwater inspection well, 2—Reservoir tank, 3—Incline plate, 4—Manhole, 5—Sink, 6—Aeration pipe, 7—Abandonment pipe, 8—Water inlet pipe, 9—Reuse Outlet pipe, 10-1# baffle, 11-2# baffle, 12-3# baffle, 13-support plate, 14-ground.

Detailed ways

The present invention is described in further detail below from the angle of intercepting initial stage rainwater process:

Referring to Fig. 1, Fig. 2 and Fig. 3, the rainwater abandonment well at the initial stage of integration is composed of a rainwater inspection well 1 and a storage tank 2. One side of the rainwater inspection well 1 is connected to a water inlet pipe 8, and the other side is oppositely connected to a reused water outlet pipe 9. The bottom of the rainwater inspection well 1 is provided with a gutter 5 and a 1# baffle 10 for initial rainwater diversion, and the 1# baffle 10 is located next to the gutter 5 and is close to the reuse outlet pipe 9 side. Sink 5 is opened in the middle of 3# baffle plate 12 that rainwater inspection well 1 bottom end is provided with.

The storage tank 2 is arranged under the rainwater inspection well 1, and communicates with the rainwater inspection well 1 through the lower water tank 5; a water outlet is provided at a position far away from the lower water tank 5 of the storage tank 2. A sloping plate sedimentation structure is arranged at the water outlet, and a discarding pipe 7 is connected behind the sloping plate sedimentation structure, and the diameter of the discarding pipe 7 starts from a smaller end than the end. The inclined plate sedimentation structure adopts two inclined plates 3, and the two inclined plates 3 form an angle α with the bottom of the pool, which is 45° or 60°. Plate 13 is supported, and 2# baffle plate 11 is provided on the inclined plate above.

The formula for calculating the distance between the two inclined plates 3 is as follows:

b≥

Among them: b is the distance between two slanting plates, mm; D ₄ is the diameter of small pipe jettison flow, mm, generally 40-80㎜; h ₁ is the height of 1# baffle, mm; h ₂ is the top of the storage tank The height difference between the outer wall of the top and the bottom of the jettison pipe, mm; B is the width of the inner wall of the storage tank, mm.

The lower water tank 5 is horizontally arranged at the center of the bottom end of the rainwater inspection well 1, and the centerline of the lower water tank 5 is perpendicular to the axis of the water inlet pipe 8; the height _h1 of the 1# baffle plate 10 is higher than the reused water outlet pipe The bottom of the 9 pipe is lower than the center line of the recycled water outlet pipe 9, its width is the pipe diameter D ₁ +200mm of the water inlet pipe 8, and it is facing the center of the water inlet and outlet pipes.

The water passing area of the lower water tank 5 is equal to the cross-sectional area of the water inlet pipe 8, and the width of the lower water tank 5 is obtained by calculation, and the calculation formula is as follows:

d=(π/4)×(D ₁ ² /D ₂ )

Among them: d is the width of the gutter, mm; D ₁ is the diameter of the rainwater inlet pipe, mm; D ₂ is the diameter of the rainwater inspection well shaft, mm.

The pre-embedded pipe diameter _D4 at the starting end of the discarding flow pipe 7 in the wall of the storage tank 2 is 10%-20% of the water inlet pipe 8 diameter _D1 , and the pipe diameter _D4 is 40-80mm. After the pipe exits the pool, the pipe diameter becomes D ₃ , where D ₃ =300mm, and the jettison pipe 7 is finally connected to the municipal sewage system.

The volume and the effective water depth of the storage tank 2 are calculated, and the calculation formulas are as follows:

V=ψ×H×A×10 ^-3 h ₄ = hh ₃

Among them, V is the volume of the storage tank, m3; ψ is the runoff coefficient; H is the initial rainfall that needs to be abandoned, mm, 3-12mm; , m ² ; h ₄ is the effective water depth of the storage tank, m; h is the design height of the storage tank, which is determined by the volume of the storage tank, m; h ₃ is the height of the inclined plate, where h ₃ =COSα, α is the inclined plate Angle with the bottom of the pool, m;

The storage tank 2 is also provided with manholes 4 and vent pipes 6; the manholes 4 are provided one before and after the inclined plate sedimentation structure. Vent pipe 6 is located on a corner of the storage tank.

With the above-mentioned structure, when runoff begins to form on the catchment area, the rainwater enters the rainwater inspection well 1 through the water inlet pipe 8, but is not stored in the rainwater inspection well 1, but enters the storage tank 2 through the sink 5, and the water flows through The inclined plate 3 flows to the jettison pipe 7, and the water level in the well rises accordingly. When the water level reached the bottom of the jettison 7 (i.e. the lowest water level), the initial rainwater began to be slowly discharged from the jettison 7 .

Because the diameter of the starting end of the jettison pipe 7 is far smaller than the diameter of the water inlet pipe 8, the outflow of the jettison pipe 7 is far smaller than the water intake of the water inlet pipe 8, and the rainwater is stored in the storage tank 2, and the runoff of the rainwater The liquid level of the rainwater in the storage tank 2 is constantly rising. After the storage tank is full, the rainwater no longer passes through the sink 5 and is directly stored in the rainwater inspection well. The capacity of the storage tank 2 can be recycled according to the specified rainwater sink. Accurate calculation of rainfall in a certain millimeter on the water area.

When the rainwater liquid level in the rainwater inspection well 1 reaches the bottom of the reuse outlet pipe 9 (i.e. the highest water level), the reuse rainwater begins to flow out from the reuse outlet pipe 9, because the inlet and outlet pipes and nozzles are in the same vertical direction along the water flow direction. On the surface, the distance between them is short, and the rainwater inspection well is separated from the storage tank by the gutter, so a short flow is formed between the inlet and outlet pipes, and the rainwater with poor water quality in the early stage is discarded in the storage tank to improve the quality of reused rainwater.

After the rainfall stops, the water flow in the inlet and outlet pipes stops, and the jettison pipe 7 slowly discharges the rainwater in the storage tank 2, and the solid pollutants that enter the storage tank 2 with the initial rainwater settle at the bottom of the storage tank and reach the minimum level. Stop the flow after the water level. During the whole process, the abandoned flow rainwater must flow through the 2# baffle plate 11 and the inclined plate 3 provided at the bottom of the storage tank to form the inclined plate precipitation effect, and the pollutants are trapped on the side away from the abandoned flow pipe 7, so Solid pollutants are not easy to block the waste flow pipe, and the short distance from the beginning of the waste flow pipe 7 (pool wall thickness) is small in diameter, and the rear end is large in diameter, which is also easy to clear;

The solid pollutants settled at the bottom of the storage tank are discharged by a small sand suction pump after several times of rainwater abandonment. When the waste flow pipe is blocked, the cleaning personnel use the submersible sewage pump to empty the rainwater in the well into the storage tank for dredging Discard the flow tube.

Claims (8)

1. The rainwater abandonment well at the initial stage of integration is characterized in that it is composed of a rainwater inspection well and a storage tank: One side of the rainwater inspection well is connected to the water inlet pipe, and the other side is connected to the water outlet pipe; the bottom of the rainwater inspection well is provided with a gutter for initial rainwater diversion and a 1# baffle plate, and the 1# baffle plate is located at the bottom of the rainwater inspection well. Next to the sink next to the side of the outlet pipe; The storage tank is located under the rainwater inspection well, and communicates with the rainwater inspection well through the sink; a water outlet is provided at a position far away from the sink tank of the storage tank, and a sloping plate sedimentation structure is arranged at the water outlet , there is a jettison pipe connected behind the inclined plate sedimentation structure, and the diameter of the jettison pipe is smaller at the beginning than at the end; The lower water tank is horizontally arranged at the center of the bottom end of the rainwater inspection well, and the central axis of the lower water tank is perpendicular to the axis of the water inlet pipe; the top of the 1# baffle is higher than the bottom of the outlet pipe and lower than the outlet pipe The width of the central line is the diameter D ₁ of the water inlet pipe + 200㎜, and the 1# baffle is facing the center of the water inlet and outlet pipes. 2. The integrated initial rainwater abandonment well according to claim 1, characterized in that: the water passing area of the sewer tank is equal to the cross-sectional area of the water inlet pipe, and the width of the sewer tank is obtained by calculation, and the calculation formula is as follows: d=(π/4)×(D ₁ ² /D ₂ ) Among them: d is the width of the gutter, mm; D ₁ is the diameter of the rainwater inlet pipe, mm; D ₂ is the diameter of the rainwater inspection well shaft, mm. 3. The integrated initial rainwater abandonment well according to claim 1, characterized in that: the sloping plate sedimentation structure at the water outlet of the storage tank adopts two sloping plates, and the two sloping plates are in the same shape as the bottom of the pool. The α angle is 45° or 60°, and the two sloping plates are arranged obliquely in parallel, the lower sloping plate is supported by a support plate, and the upper sloping plate is provided with a 2# baffle; The formula for calculating the distance between the two inclined plates is as follows: b≥

Among them: b is the distance between two sloping plates, mm; D ₄ is the diameter of the small pipe discarded flow, which is 40-80㎜; h ₁ is the height of the 1# baffle, mm; h ₂ is the upper and outer wall surface of the storage tank The height difference from the bottom of the jettison pipe, mm; B is the width of the inner wall of the storage tank, mm. 4. The integrated initial rainwater abandonment well according to claim 1, characterized in that: the diameter _D4 of the pre-embedded pipe at the beginning of the abandonment pipe in the storage tank wall is 10%-20% of the diameter _D1 of the inlet pipe %, the pipe diameter becomes D ₃ after the pipe exits the tank body, and the discarded flow pipe is finally connected to the municipal sewage system. 5. The integrated initial rainwater abandonment well according to claim 4, characterized in that: the diameter D ₃ of the abandonment pipe is 300 mm, and the diameter D ₄ is 40-80 mm. 6. The integrated initial rainwater abandonment well according to claim 1, characterized in that: the volume and effective water depth of the storage tank are obtained by calculation, and the calculation formulas are as follows: V=ψ×H×A×10 ^-3 h ₄ = hh ₃ Among them, V is the storage tank volume, m ³ ; ψ is the runoff coefficient; H is the initial rainfall that needs to be abandoned, mm, 3-12 mm; area, m ² ; h ₄ is the effective water depth of the storage tank, m; h is the design height of the storage tank, which is determined by the volume of the storage tank, m; h ₃ is the height of the inclined plate, where h ₃ =COSα, α is the slope The angle between the plate and the bottom of the pool, m. 7. The integrated initial rainwater abandonment well according to claim 1, characterized in that: the storage tank is provided with manholes and ventilation pipes; the manholes are respectively provided one before and after the inclined plate sedimentation structure. 8. adopting the method for rainwater abandonment flow carried out by the integrated initial stage rainwater abandonment well described in claim 1, its process is as follows: 1) When runoff begins to form on the catchment area, the rainwater enters the rainwater inspection well through the water inlet pipe, and then enters the storage tank through the sink; 2) The water flow in the storage tank passes between the two sloping plates, forming a sloping plate sedimentation effect, intercepting solid pollutants on the side away from the waste flow pipe, ensuring that no solid pollutants flow through the waste flow pipe, and avoiding blockage of small diameter pipes; 3) Since the diameter of the beginning of the jettison pipe is much smaller than the diameter of the water inlet pipe, the outflow of the jettison pipe is much smaller than the water inflow of the water inlet pipe, and the initial rainwater begins to be stored in the storage tank. , the storage tank is full, and the rainwater begins to be stored in the rainwater inspection well; 4) When the liquid level of rainwater in the rainwater inspection well reaches the top of the water retaining plate on the sink tank, the reused rainwater begins to flow out from the outlet pipe. Due to the short distance between the inlet and outlet pipes, and the rainwater inspection well and the sink tank The storage tank is separated, which effectively prevents the flow exchange between the rainwater inspection well and the storage tank. The rainwater forms a short flow between the inlet and outlet pipes, and the rainwater with poor water quality in the early stage is discarded in the storage tank to improve the reuse of rainwater. water quality; 5) When the rainwater runoff stops, the water flow between the inlet and outlet pipes stops, and the waste flow pipe slowly discharges the rainwater in the storage tank, and stops after reaching the effective minimum water level; 6) The solid waste entering the storage tank with the initial rainwater settles at the bottom of the tank, and after a period of time, it is discharged with a small sand suction pump. When the waste flow pipe is blocked, the cleaning personnel enter the storage tank to dredge the small pipe section. Disposal flow pipe, the small pipe diameter is pre-buried at the beginning of the waste flow pipe and the distance is short, only the length of the wall thickness of the storage tank is adjusted, which is convenient for dredging blockage.

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